Read and parse configuration data from the file or file-like object in
fp (only the readline() method is used). If
filename is omitted and fp has a name attribute,
that is used for filename; the default is "<???>".

Get an option value for the provided section. All the
"%" interpolations are expanded in the return values, based on
the defaults passed into the constructor, as well as the options
vars provided, unless the raw argument is true.